how to delete multiple contacts on one time

Greetings shahroz209,

If you are having difficulty deleting contacts on your devices, follow the guidance found here:

Manage and delete contacts on your iPhone, iPad, or iPod touch - Apple Support

"Delete a contact

When you delete a contact, it permanently deletes it from your device. And if you delete a contact from your email account, you also permanently delete the contact from all devices signed into that email account.

Here's how to delete a contact:

1. Open Contacts and tap the contact that you want to delete.
2. Tap Edit.
3. Scroll Down and tap Delete Contact then tap Delete Contact again to confirm."

Take care.